SY21031
SY21031 is 0.8A Asynchronous Step-Down Regulator manufactured by Silergy.
High-Efficiency, 1.2MHz, 55V Input, 0.8A Asynchronous Step-Down Regulator
General Description
The SY21031 high-efficiency asynchronous stepdown DC/DC regulator is using an adaptive constant off-time architecture, and can deliver 0.8A current over a wide input voltage range from 4.5V to 55V. It integrates a main switch with low RDS(ON) to minimize conduction loss.
The 1.2MHz switching frequency permits low output-voltage ripple and reduces the external inductor and capacitor sizes. The SY21031 also provides cycle-by-cycle current limiting and hiccup short-circuit protection.
The feedback resistors (RH and RL), the input capacitor CIN, the output capacitor COUT, the output inductor L, along with the freewheeling Schottky diode D1, need to be selected for the targeted application.
The SY21031 is available in a pact SOT23-6 package.
Features
- 4.5V to 55V Input Voltage Range
- Up to 0.8A Output Current
- Low RDS(ON) for Internal N-Channel Power
FET: 700mΩ
- 1.2MHz Pseudoconstant Switching
Frequency
- Adaptive Constant Off-Time Control
- Internal Soft-Start Limits Inrush Current
- ±1% 0.6V Reference
- Hiccup Mode Short-Circuit Protection
- EN On/Off Control with Accurate Threshold
- Cycle-by-Cycle Peak Current Limit
- Ro HS-pliant and Halogen-Free
- pact SOT23-6 Package
Applications
- Non-Isolated Telemunication Buck Regulator
- Secondary High-Voltage Post Regulator
- Automotive Systems
Typical Application
VIN:4.5-55V CIN
ON/OFF
L1...
